In a 10000 -meter race between the hare and the tortoise, the hare's speed was 5 times that of the tortoise. They started at the same place and at the same time and ran at constant speeds. The hare ran for a while, then went to sleep. The tortoise ran all the time. When the hare awakened, he tried to catch the tortoise but was 100 meters behind when the tortoise crossed the finish line. How far, in meters, did the tortoise run while the hare was sleeping?

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